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  DB<1> print sprintf "%.2f", 10/3;
3.33

  DB<2> printf "%.2f", 10/3
3.33

$ perl -e 'printf "%.2f\n", $_/20 for 1..10'
0.05
...
0.40
0.45
0.50

$ perl -e 'printf "%.1f\n", $_/20 for 1..10'
0.1
...
0.4
0.5
0.5